Determining number heartbeats the data.

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hi everyone, I am using the MIT-BIH Arrhythmia Database and was asked to get 10 consecutive minutes, and i did and then three colums, first for time, second for MLII and third for V5 and ended up with these

x = txt(1:86401,1);
y = txt(1:86401,2);
z = txt(1:86401,3);
hold on;
plot(x,y)
plot(x,z)

but i am asked to determine number of heart beats and duration of the time interval between successive heart beats, and this is without using a filter, how would i do that since data number is so large and heartbeats are very small?

thanx so much